21660792 has 32 divisors (see below), whose sum is σ = 55475280. Its totient is φ = 7043840.

The previous prime is 21660791. The next prime is 21660827. The reversal of 21660792 is 29706612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21660791) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10023 + ... + 11990.

Almost surely, 2^21660792 is an apocalyptic number.

It is an amenable number.

21660792 is an abundant number, since it is smaller than the sum of its proper divisors (33814488).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21660792 is a wasteful number, since it uses less digits than its factorization.

21660792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22063 (or 22059 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 21660792 is about 4654.1155980487. The cubic root of 21660792 is about 278.7563551676.

The spelling of 21660792 in words is "twenty-one million, six hundred sixty thousand, seven hundred ninety-two".